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How does the body detect changes in plasma volume and osmolarity?

User TimChang
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In normal people, increased osmolality in the blood will stimulate secretion of antidiuretic hormone (ADH). ... An increase of only 2% to 3% in plasma osmolality will produce a strong desire to drink. A change of 10% to 15% in blood volume and arterial pressure is required to produce the same response.
User Cccnrc
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